This week in the world of cartoons, Casey Jones stars on Teenage Mutant Ninja Turtles, the season finale of Ultimate Spider-Man airs, and we welcome the newest show from an Adventure Time alum, Steven Universe.

Avengers Assemble is currently slated to return next week. As always - minor spoilers ahead!

Adventure Time - "Play Date"

Finn and Jake, ready to have the tree house to theirselves, set up a play date between their roommate Ice King and Abracadaniel. Check out wizards at play in this clip.

Steven Universe - "Gem Glow & Laser Light Cannon"

This new show is from the mind of Rebecca Sugar, who wrote and storyboarded some of your favorite episodes of Adventure Time. Steven Universe is about a team of space-faring female warriors and their lone male member, Steven. The clip above is from "Gem Glow", the first of back to back episodes that aired this week.

Regular Show - "Tants"

It's the anniversary of the park that Regular Show revolves around..the Parkiversary! To celebrate, Pops gives Mordecai and Rigby "tants" - a pair of pants that transform into a table. If you are a fan of Regular Show and visiting your local comic book store this weekend, check out the new miniseries spotlighting Skips.

Teenage Mutant Ninja Turtles - "Mutagen Man Unleashed"

Casey Jones makes an appearance this week, with the hockey-stick-wielding 5th turtle helping to clean up one of Donatello's failed mutagen experiments. It looks like Donatello will have some competition for April's affection.

Legend of Korra - "A New Spiritual Age"

Korra follows the ancient path of the first Avatar, Wan, this week as she continue her adventures in the spirit world.

Hulk and the Agents of S.M.A.S.H. - "The Skaar Whisperer"

Skaar, the alternate reality son of the Hulk, gets schooled in the ways of interpersonal communication by Doc Samson (i.e. the "Skarr Whisperer") as the Agents of S.M.A.S.H. fight the Wrecking Crew.

UItimate Spider-Man - "Ultimate"

It's the season finale of Ultimate Spider-Man, so you can expect one thing - a showdown with the Green Goblin. What will Parker do to stop the "goblinized" versions of Nova, Iron Fist, and Luke Cage?

Top image is from Nickelodeon's Teenage Mutant Ninja Turtles via a picture hosted at NickAlive.